The most important piece of advice that I have is to live everyday like you mean it, and not let others rule your life. You control your life, and you need to be proud of it at the end of the day.
I have to remind myself of these two things daily. Literally. I get too caught up in what others think of me, or what I think someone else would want me to do that I don't fully realize what I want to do or what I want my life to look like from the outside in.
And if you aren't proud of yourself at the end of the day how can anyone else be proud of you? Life is way too short to live it like you don't mean it.